For my part, I haven't gotten anything new yet, so if you've read my recommendations before, I apologize for any repeats. Roguelike Edition, apparently.
PlateUp! is my favorite couch coop game on Steam. You and up to three friends work together to run a restaurant. It's a little like Overcooked, but instead of having different wacky levels to get through, you choose a menu (starting with one dish), and build up your restaurant day after day. Every few days you will have to choose a new complication (like another dish or reduced customer patience). The goal is to get through 15 days of service without a single dissatisfied customer, so it's like a restaurant roguelike. It's currently 70% off and 94% Positive all time.
Dead Cells is a very fun sidescrolling roguelike that feels a bit like a Metroidvania. Collect weapons, kill monsters, die, repeat. It's currently 50% off and Overwhelmingly Positive all time.
FTL: Faster Than Light is a classic roguelike at this point. You must traverse the different sectors of the galaxy to reach and destroy the Rebel Flagship. You can order crew members around in real time, while the ship weapons take time to recharge, giving a turn-based feel. It's 70% off and Overwhelmingly Positive all time.
Noita is an amazing roguelike as well. You play a wizard attempting to explore down into the earth for treasure. Every pixel in the game is made out of a material, from plain old Dirt to flammable Oil to useful Water. Find treasure and new magic wands. Mix and match the spells on your wands to make new effects -- and even utterly broken bullshit. It's 60% off and Overwhelmingly Positive all time.
What about you? What do you recommend?
The ongoing shitshow that is 4.0 would say otherwise. It's now on patch 21 in 2 months since release, multiple older and new features flat out don't work, there have been kneejerk reactions to OP builds nerfing the absolute shit out of mechanics that only worked when paired with other things leaving them now even worse than they were before, certain mechanics have been changed to no longer match what they were originally designed to do, and because Paradox is in based in Stockholm all the devs are currently on mandatory summer holiday so the current state of the game is stuck like that for at least another month after already several weeks or similar holiday related hiatus.
Second what you said about so much being broken. The potential here is huge, and I can see it clearly if I play a basic-bitch empire. The new growth and civilian mechanics have interesting implications. But, 4.0 needed like three more months in the oven minimum.
That said, it is a terrible time for a new player to enter the game. We'll probably lose most who try right now.